Review of Semester 1 2022

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

What does the 6 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

What does 12.011 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

Which elements are colored red?

• nonmetals

• metals

• metalloids

Tags

NGSS.HS-PS1-1

All of these properties describe metals except...

• malleable
• conductors
• brittle 
• shiny

What is the Lewis dot structure for a neutral atom of phosphorus (₁₅P)?

• The element symbol P with 15 dots around it.

• The element symbol P with 8 dots around it.

• The element symbol P with 3 dots around it.

• The element symbol P with 5 dots around it.

Answer explanation

The Lewis dot structure for a neutral atom of phosphorus (₁₅P) should be made up of the element symbol P with 5 dots around it. These 5 dots represent the 5 valence electrons in a neutral atom of phosphorus.

Tags

NGSS.HS-PS1-1

What is the correct Lewis Dot Structure for ammonia NH3

• 
• 
• 
• 

Tags

NGSS.HS-PS1-2

Which of the following is an acceptable Lewis structure for CH₃Cl?

• Option A
• Option B
• Option C
• Option D

Tags

NGSS.HS-PS1-1

In HCN (Carbon is usually the central atom) what kind of bond is between the C and N

• Single

• Double

• Triple

What is the VSEPR theory used to predict?

• Bond Strength
• Polarity
• Molecular Shape
• Electronegativity